I'm using Internal Volume mode with ASIO output and a ASUS Xonar Essence STX soundcard with headphone output.
I may have been a bit hasty to judge it as not working as it seems to be operational just that volume has to be set a lot higher now to achieve the same loudness as before, especially as the volume already had to be increased with the Isone plugin enabled.
Music with the plugin disabled is quieter than it was before too, but I guess you made changes to the way internal volume is handled?
Also I see the 17.0.99 update brought DSP changes too, but I don't understand what the significance of them are:-
should I tick the option for processing independently of internal volume for the TB Isone plugin or leave as is?
The only change I notice when I click the option is that the VU meter in the plugin displays higher volumes upon playback even though the perceived loudness through my headphones remains the same?
Currently I am playing my music with ISone at an average of about 66 to 68% whereas before the 17.0.99 update I was playing at probably about 38% average. Oh and I am on the stable update channel too.